Excavator



L. P. GREEN.

EXCAVATOR, APPLICATION FILED JUNE 24, I9 2I- PatentedSept.26,1922.

Fatented 2%, 1922.

LESLIE P. GREEN, OF CHICAGO, ILLINOIS.

EXCAVATOR.

Application filed June 24, 1921'. Serial No. 179,990.

To all whom it may concern:

Be it known that L-Lnsnin Piinnnn, a citizen of the United States, and a resident of the city oi, Chicago, county of Cook anc State of Illinois, have invented certain. new and useful Improvements in Excavators. of which the following is a specification.

My invention relates to improvements in excavators, and has for its object the pro vision of an improved construction of this character which is simple and efiicient in use. I

Other objects will appear hereinafter.

The invention consists in the combinations and arrangements of parts hereinafter described and claimed.

The invention will be best understood by reference to the accompanying drawings forming a part of this specification, and in which,

F ig. 1 is a side view of an excavator embodying the invention.

F 2 is an end view thereof.

Fig. 3 is a rear view of the excavating bucket, and

Fig. 41- is a. detail view of a stop member mounted in the construction.

The preferred form of construction aspivoted at 9 on carriage 6 and links 10 and 11 are pivoted, as shown, to the corners oi members 8 on opposite sides of the pivots 5). sin excavating bucket 12 is pivoted. as shown. to the lower ends of the links 10 and 11 and is balanced to carry its load. 1.. draw cable 13 is connected to cause the carriage 6 and the bucket 12 to traverse the areato be excavated. The cable 13 is provided with. two branches 1a and 15. The branch 14 consists of two diverging cable strands leading and attached to eyes 1&' and on the forward edges of the" excavating bucket as shown. The branch 15 consists of two diverging strands passing around the grooved guide pulleys 16 on carriage (i and connected with eyes 17 on the rocker members 8 as shown, the branches 15 passing under and beyond the pivotal axis 9. Stops 18 and 19 are arranged on carriage 6 to limit the rocking movements of the members 8 .in either direction. The excavating bucket 12 is provided with a swinging tail gate 20 pivoted thereto and carrying a spring held latch bolt 21 adapted to engage a latch bar 22 as indicated. A tripping cable 23 is attached to the latch bolt 21 and also to an eye '24 on the under side of carriage 6, the arrangement being such that when the excavating bucket 12 dumps as indicated in dotted linesin Fig. 1, the tail gate 21 will be automatically released and swing into open position to discharge the contents of the bucket.

In operation, the cables 5 and 13 are manipulated in the usual way to permit the carriage and bucket to slide down cable 5 under the influence of gravity over the area to be excavated, whereupon cable 5 is slaclc ened and cable 13 is operated as a draw cable to draw the excavating bucket back over the area to be excavated, filling the same with material in the usual way, said material being lifted by tightening cable 5 and also by the upward inclination thereof and carried in the bucket 12 until the stop 7 is encountered, said stop being positioned at the point where it is desired to dump the excavating material. When the stop 7 is encountered by the carriage 6, further travel of said carriage is prevented, whereupon the bucket 12 will be caused to swing forwardly by the tension on cable 13. This will throw the tension on to the cable strands 15 and thence on to the eyes 17 onthe rocker members 8. The cable strands 15 passing under and beyond the pivoted points 9 will cause the rocker members 8- to rock rearwardly into the dotted line positionas indicated in F 1g. 1. This Wlll cause links; 10 to'elevate the forward end of bucket 12 and links 11 to lower the rearward end thereof, thus automatically OLDQH". ing the tail gate 20 and dumping the contents of said bucket as indicated in dotted lines in Fig. 1. When tension on cable 13 is relieved, the bucket 12 assumes its normal position by the actionof gravity and because it is balanced to do so, such assumption being in any event forced by contact of the bucket with the ground as the car prec.

ring-e (3 slides down the able Renewal of the drawing torce on cable 1.3 will repeat the operation. filling the excavating bucke" and dumping the same as above outlined. It the cable strands 1e.- are adjusted a little longer than indicated, the carriage will be drawn along cable 5 bv the tension in cable strands 15 until the stop is encountered, when the dumping action will take place as above. The added slack in cable strands let permits more free dumping of the bucket and thus a complete upending thereof to lacilitate discharge. lln either arrangement, a simple and ellective excavating mechanism is provided which will carry its load to the desired point and then effectively dump and discharge the same.

lVhile l have i lustrated and described the preferred term of construction for carrying; my invention into e'llect, this capable of variation and modification without departinghour the spirit of the invention, 1, therefore, do not wish to be limited to the details of the construction set forth, but desire to avail myseltl of such variations and modifications as come within the scope of the appended claims.

Having described my invention, what I claim new and desire to secure by Letters Patent, is

1. An excavator comprising a supoor n L V 6 cable; a carriage travelling thereon; a stop for said carriage; an excavating bucket swingingly suspended on said carriage;

attached to said bucket and said dumping means and arranged to dump said bucket l'earwardly when said can c e encounters said stop; a tail gate for said bucket; and means for automatically openi said tail rate upon dumping oi said bucl Cb, substantially as described.

An excavator comprising a supporting cable; a carriage travelling thereon; a stop for said carriage; a rocker member pivotally mounted on said carriage; supporting links pivoted to said rocker member; an excavating bucket pivotally carried by said linlzs, said bucket being arranc'ml to be dumped rearwardly by rocking oi .iid member; a draw cable operatively connected with said bucket and with said rocker member; a tail ate for said bucket; and means tor autoniatically opening said tail gate upon dumping of said bucket, substantially as described.

3. An excavator comp 'isin g, a travelling carriage; an excavating; bucket supported thereon; a draw cable having two branches, one leading to said bucket and the other to said carriage; means operable by a shift of tension from one of said branches to the.

other for dumping said bucket rearwardly; a

tail gate for said bucket: and means tor automatically opening said tail gale upon dumping of said bucket, substantia ly as described.

42. An excavator comprising a supporting cable; a carriage travelling thereon; a stop for said carriage on said cable; a draw cable having two branches, one leading to said carriage and the other to said bucket; means operable by a shift of tension from one oil said branches to the other for dimming said bucket rearwardly; a tail gate tor said bucket; and means for automatically opening said tail gate upon dtunpi'ng; of said bucket, substantially as described.

An excavator conuqiising a supporting cable; a carriage travelling thereon; a stop for said carriage on said cable; triangular rocker men'ibcrs pivoted on said carriage; supporting lilllIS pivoted to said rocker members on opposite sides of the pivot thereof: an excavating bucket suspended on said links and balanced to carry its load; a draw cable having two l' anches, one la'ancn leading to said bucliet and the other to said. rocker members, and adapted. and :uirans god to rock said rocker members rearwardly when tension is shifted thereon; a tail gate for said bucket; and means for automatically opening said tail gate upon dumping or said bucket, substantially as described.

6. An excavator comprising supporting cable; a carriage travelling thereon; a rocker member on said carriage; an excavating bucket supported on said rocker member to be dumped rearwardly by rocking thereof; in ans tor rocking said rocker member; a tail gate tor said bucket; and means for automatically opening said tail gate upon dumping of said bucket, substantially as described.

i. an excavator comprising a supporting cable; a carriage travelling thereon; a stop for said carriage on said cable; a rocker member pivoted on said carriage; an excavating bucltet suspended on said rocker member on opposite sides of the pivot thereof; a draw cable having two branches, one leading to said bucxet and the other to said rocker member and adapted to rock said I'UCl-IGI member to cause rcarxxnrd dumping oi said bucket upon stopping of said carriage; a tail grate for said ljlllt'liGt; and means for automatically oi ieningr saiigl tail grate upon dumping- ()l f said bucket, substantially as described.

.ln testimony wl'iereol" l have signed my nine to this specification in the presence of two subs *ribing witnesses.

LESLIE l. GREEN.

Witnesses JOSHUA. R. H. Porrs, B. G. RICHARDS. 

